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dct-idct coding
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The input 8x8 image data block includes integers in the range from 0 to 255. The average value calculated in DCT subtracts 128 redundancy from the smallest input data block in the input data. The core can calculate the range of input data 128 to 127 and –. Then, the average is 128. In the calculation of DCT, the data can be reduced to the important information and concentrated to a few DCT results, leaving the remaining coefficient equal to zero. This means that the energy of the image is concentrated
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lsb based visible and invisible watermarking
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<span style="font-size:12.0pt;line-height:150%;font-family:"">Theincreasing amount of digital exchangeable data generates new informationsecurity needs. Users expect that robust solutions will ensure copyrightprotection and also guarantee the authenticity of multimedia documents. In this project Image Watermarking usingLeast Significant Bit (LSB) algorithm has been used for embedding themessage/logo into the image. The designing process is carried out in theXilinx ISE design suite 12.4 and the hardware description language used isVHDL. The design is simulated and the waveforms are verified in the Isim(M.81d) simulator. Once the designing process is completed, the design isimplemented in the Spartan3 FPGA board. The watermarked images are in goodvisual quality and have good PSNR values. Both visible and invisiblewatermarking scheme is implemented .The effectiveness of the proposed sch
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